Alternating-current motor.



WITNESSES:

No. 871,189. PATENTED Nov; 19, 1907.

' L. SOHYILER.

ALTERNATING CURRENT MOTOR.

APPLICATION FILED APR. 22, 1904.

Fig.1.

2 SHEETS-SHEBT mug/vim posed of the coils 12 and 13.

'nating current is supplied from an external UNITED STATES PATENT OFFICE.

LEO SCHIILER, OF ST. LOUIS MISSOURI, ASSIGNOR TO WAGNER ELECTRIC MANUFACTURING COMPANY, OF ST. LOUIS, MISSOURI, A CORPOItATION OFMISSOURI.

ALTERNATING-CU'RRENT MOTOR Specification of Letters Patent. Patented Nov. 19, 1 907. A rais l filed Apr-i122. 1904. Serial no. 304.373. i i

I in series with the coil19 bymeansof acon- Be t'known that I, LEO ScHi'ILER, a sub- 'ductor 20. The coil 19' is also connected ect oi the Emperor of Germany, residing at 1 with the conductor 15. The third ar d last l To all whom it may concern:

the city of St. Louis, in the State of Missouri, grou constituting the, field winding is comhave lnvented a certain new and useful Al-, pose of the coils 21' and 22 which are conternatmg-Current Motor, of which the fol nected in series by'mean's'of the conductor lowing 1s sucha full, clear, and exact descrip- 23. 24; is a contact point within the reach of tion as will enable any one skilled in the art the switch-wand connected with thecoil '21. to which it appertains to make and use the The coil 22 islconnected with the conductor same, referencebeing had to the accompany- 15. It will thus be seen that the field windmg drawings, forming part of this specificaing of the motor is composed of three section. A t ions; said sections being all connected to- My invention relates to alternatingrcun gether. at a common point-the conductor rent induction motors, and more specifically 15;-after the manner of the ordinary star to means for reversing the direction of rotaconnection commonly employed in polytion of such motors. It is a plicable to a phase circuits. r number of different forms 0? motors, but Referrin now to the rotary member or more particularly to single-phase motors of armature .o the-motor which, in the particuthe self-starting variety in which one of the lat form shown inthe drawin s, is also the members is provided with a winding the cur induced member, it is composed'of a winding rents in which are commuted at starting to produce definite'armature magnetic poles. I

25 connected by means of leads 26 to the segments 27 of a commutator. Brushes-28 bear upon this commutator, and are connected by means of a conductor 29 which may be of any'resistance desired. From equidistant points'30in the winding 25 are led conductors 31. These conductors are connected with the three divisions 32 of a resistance. .33 is a pivoted member provided with arms adapted to move over'the' contacts 34:,conriected to the resistance 32, to gradually exclude said resistance from the armature circuit. 38 are open circuit contacts adjacent to the contacts 34. When provide such a motor with a subdivided field Winding, the organization or electrical connections of which may bemodified at the will of the operator to reverse the direction of movement of the rotary member of the motor.

In the drawings, in which like characters of reference refer to similar parts in the different views, Figure 1 represents indiagram a type of induction motor embodying my invention; and Fig. 2 is a diagram of a modified form of my invention.

Referring first to Fig. 1, 10 and 11 indicate the mains through which single-phase" alterthe contacts 38,'therethe arm 33 rests upon through the conducby opening'the circuit tors 31.

Referring now to Fig. 2, it will be seen that the-fieldof the motor there shown differs from the field of the motor shown in Fig. 1 only in that-the coils 18, 19, 21, and22 are of less length than the coils 12 and 13. The connections of the coils are identical wlth those described in connection with Fig. 1.' The arrangement of the resistance 32 with res ect to the armature is also somewhat derent from that shown in Fig. 1 in that the three conductors 31 are connected to l source to the stationary member or field of the i motor. The winding of this field is divided into three groups; each roup being divided into two coils. One of t ese groups is com. One end of the coil 12 is connected to the main 11', and the other end is connected, by a conductor 14, to. one of the ends of the coil 13. The opposite end of the coil 13 is connected to the conductor 15. It will thus be seen that the two coils of this group are connected in series. 16 is a i switch, by means of which the main 10 may be electrically connected with the conductor 17. This conductor 17 is connected with one of the coils 18 of the second group constitutin the field winding. The coil 18 is connecte armature. -This arrangement 130:

e windings 25 of the motor is started, as hereinafter described,

brushes 35 which bear upon slip rings 36.

1O when the switch 16 andthe' brushes 28 are in the positions there shown,'.the polesof the 'ings 25 of the motor.

dently of advantage where, as shown in the drawings, the member of" the motor, to which this resistance is connected, is a rotary member to be stationary and to be located external to and at a distance from the motor, thus facilitating regulation of the motor speed at the will of the operator.

In the operation of my invention, and referring first to Fig. 1, it will be evident that armature will lie in substantially tion indicated by the dotted line that, as the coils 12, 13, .18, and active 0 eration and the coils 21 and 22 are excludec from circuit, the field generated by said active coils will have its axial line substantiallyv coincident with the line B B.

the posi- A A, and

Under these circumstances the motor willstartfrom rest-and rotate in a given direction with a torque dependent upon the an-' gular displacement of the line B B from the line A A. Should, however, the switch 16 rest upon the contact 24, the coils 21 and 22 since it permits the resistance 32.

19 are'in would be cut into circuit and the coils 18 and 19 excluded from circuit. and 13 are permanently connected in circuit the axis of the resulting field would lie substantially in the position indicated by the dotted line (l C. The position of the brushes remainingthe same, it is evident that the motor would now be rotated in a direction opposite. to that at which it would rotate were the coils 18 and 19 in circuit. It is thus evideiit that the direction of rotation of my motor may be reversed at will.

The operation of the motor shown in Fig. 2 is substantially identical with that above described. Owing, however, to the fact that the coils 12 and 13 are of greater length than the coils 18, 19 and 21, 22 the angular displacement of the axial lines B B and C" C of the field poles from the axial line A A of the armature poles is less than the angular displacement of the corresponding lines in Fig. 1. This results in a variation of the torque. A further advantage of this construction is that as one of the sets of coils 18, 19 or 21, 22-remains idle during a portion of the time, I am enabled by reducing the length of these coils to diminish the amount of idle winding in the motor field.

It will, of course, be understood. that I prefer to start my motor with.the arm 33 in the position shown in Fig. 1, thereby opening the circuit through the'resistance 32. After the motor has received an initial rotation,

the arm 33 isrotated to first include and then gradually exclude the resistance 32 from circuit and thus short circuit the windl/Vhen this is done the arm 33 occupies the position shown in Fig. 2 and the'br'ushes 28 are practically excluded from any active participation in the opera- As the coils 12 cutting. the resistance ductor into or out of e ective o eration to shift the oles of said second mem er relative to the po es of said first named member,

2. Ina motor, the combination with a member provided with a circuit for producing definite poles therein, of a second member provided with a main conductor, an auxiliary conductor for said second member and adapted to cooperate with said main conductor, and means forcutting said auxiliar con-- ductor into or out of effective operation to shift the poles of said second member from one side to the other of the poles of said first named member.

3. In a motor, the combination with a member provided with a circuit for producing definite poles therein, of a second member provided with a main conductor, an auxiliary conductor for saidsecond member of different magnetic eflect from said main conductor an adapted to cooperate with said main conductor, and means for cutting said auxiliary conductor into or out of effective operation to shift the poles of said second member relative to the poles ofsaid first named member.

4. Ina motor, the combination with a' member provided with a circuit for producing definite poles therein, of a second member provided with a main-conductor, an auxiliary conductor for said second member of less magnetic effect than said. main conductor and adapted to cooperate with said main conductor, and means for cutting said auxiliary conductor into or out of efiectiveo eration to shift the poles of said second mem er relative to the poles of said first named member.

5. In a motor, the combination with a member'provided with a circuit for producing defimte magnetic poles therein, of a second member having a main conductor, aux-' iliary conductors for saidsecond member adapted to cooperate with said main conductor, and means for cutting one of said auxiliary conductors into efi'ectiv'e operation and another of said auxiliary conductors out of effective operation to shift the poles of said second member relative to the poles of said first named member.

6. In a motor, the combination with a member proyided with a circuit for producing definite magnetic poles therein, of a second member having a main conductor, auxand the other of said auxilia ductors for said member and each composed .vided witha circuit a second member pros -motor having a commutator and brushes,

said brushes eing iliary conductors for said second member adapted to cooperate with said m'ain conductor, and means for cutting one of said auxiliary conductors into effective operation,

conductors out of efiective operation to s t the poles of said second member from one side to the other of the poles of said first named member.

7. In an electric motor, a member pro-- vided with a circuit, a second member provided with a main conductor rmanently in circuit and composed of a plii rality of diametrically opposite sections, auxiliaryconof a plurality of sections situated between the sections of said main conductor, and means for cutting one' or another of said auxiliary conductors into efiective operation.

8. In an electric motor, a member proyided with a main conductor permanently in circuit, a plurality of auxiliary conductors a forsaid second member, and means for cutting one or another of said auxiliary conductors intoefiective o ration, said conductors being all connecte together at a common point.

9. In combination, an alternating-current motor having main field coils and two sets of auxiliary field coils, a rotor winding for said ne'tization produce glaced on the line of mag by said main field coils,

and means for energizing either set of auxiliary coils.

10. In combination, an alternatin -c1 1rrent motor having main field coils and sets of auxiliary field coils, a rotor winding having a commutator and brushes, said brushes being placed on the line of magnetization produced by said main coils, and a switch adapted to connect either set of auxiliary coils in series with said main coils.

11. In combination, an alternating-current motor, a rotor winding therefor having two a commutator and brushes, main field coils arranged to magnetize said motor on the hue of said brushes, two sets of auxiliary coils ar ranged to produce magnetization at an angle to that of said main coils, and a switch adapt ed to connect either of said sets in series with said main coils and. means for energizing either of said sets. 12. In combination, an alternating-(mp rent motor, mam field coilstherefor, auxiliary field coils on either side of said main coils, I

and a switch adapted to connect in series with said main coils the auxiliary coils on either side thereof.

In testimony whereof, I have hereunto set my hand andaffixed my seal, in the presence of the two subscribing witnesses.

LEO bCHULER.

Witnesses:

L. B. BEACH, D. C. BETJEMAN. 

